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Method for preparing porous material from TDI solid tar residues, and application of porous material

A porous material, tar technology, applied in chemical instruments and methods, inorganic chemistry, water/sludge/sewage treatment, etc., can solve the problems of high treatment cost and low efficiency of TDA wastewater treatment, and achieve good and significant removal effect. Environmental friendliness, the effect of reducing the amount of incineration

Active Publication Date: 2022-01-14
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The extraction method of the above-mentioned published patent still has low treatment efficiency for TDA wastewater, and the treatment cost is relatively high

Method used

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  • Method for preparing porous material from TDI solid tar residues, and application of porous material
  • Method for preparing porous material from TDI solid tar residues, and application of porous material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Weigh 400g of TDI tar solid particles through a grinder for primary and secondary crushing and sieving, remove doped large particles, and obtain particles with a particle size of 600-1200 μm. The obtained tar particles were pre-carbonized at 550°C in a nitrogen atmosphere for 8h, and the heating rate was controlled at 2°C / min.

[0052] The charred tar particles are taken out, followed by three-stage crushing and screening to obtain tar particles with a particle size of 800-1000 μm.

[0053] The tar particles and potassium hydroxide were uniformly mixed according to the mass ratio of 1:0.8, and then transferred to a high-temperature carbonization furnace for secondary high-temperature activation for 5 hours. The heating rate was controlled at 5 °C / min in a nitrogen atmosphere until the temperature was raised to 800 °C.

[0054] Cool the tar particles after high-temperature activation to 25°C, wash them twice with 1mol / L dilute sulfuric acid, then wash them with deionized...

Embodiment 2

[0060] Weigh 400g of TDI tar solid particles through a grinder for primary and secondary crushing and sieving, remove doped large particles, and obtain particles with a particle size of 500-1400 μm. Continue to carry out pre-carbonization treatment at 450°C and nitrogen atmosphere for 6 hours, control the temperature rise rate to 3°C / min, and continue to perform three-stage crushing and sieving of pre-carbonized particles to obtain solid particles with a particle size of 800-1000 μm.

[0061] The solid particles and potassium hydroxide were uniformly mixed according to the mass ratio of 1:0.8, then transferred to a high-temperature carbonization furnace for high-temperature activation for 5 hours, and the heating rate was controlled at 5°C / min in a nitrogen atmosphere until the temperature was raised to 800°C. After cooling to 25°C, wash with 1mol / L dilute sulfuric acid and deionized water until the pH value is 6-7, and dry at 95°C to obtain the TDI tar porous adsorption materi...

Embodiment 3

[0067] Weigh 400g of TDI tar solid particles through a grinder for primary and secondary crushing and sieving, remove doped large particles, and obtain particles with a particle size of 800-1600 μm. Continue to carry out pre-carbonization treatment at 450°C and nitrogen atmosphere for 12 hours, control the heating rate to 5°C / min, and continue to perform three-stage crushing and sieving of pre-carbonized particles to obtain solid particles with a particle size of 600-800 μm.

[0068] The solid particles and zinc chloride were uniformly mixed according to the mass ratio of 1:0.5, and then transferred to a high-temperature carbonization furnace for secondary high-temperature activation for 5 hours. The heating rate was controlled at 3°C / min in a nitrogen atmosphere until the temperature was raised to 600°C.

[0069] After cooling to 25°C, wash with 1mol / L dilute phosphoric acid and deionized water until the pH value is 6-7, and dry at 95°C to obtain the TDI tar porous adsorption ...

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Abstract

The invention discloses a method for preparing a porous material from TDI solid tar residues, and application of the porous material. The method comprises the following steps: 1) carrying out primary crushing and screening on the TDI solid tar residues; 2) continuously performing secondary crushing and screening on the solid particles to obtain particles with uniform particle size; 3) carrying out pre-carbonization treatment on screened solid particles obtained in step 2); 4) continuously crushing and screening the pre-carbonized solid particles for the third time; 5) fully mixing an activating agent with the screened tar particles obtained in step 4) so as to perform primary activation on the tar particles; 6) performing high-temperature secondary activation on the mixture subjected to primary activation under the protection of inert gas; and 7) cooling, washing and drying the activated product obtained in the step 6) to obtain the TDI tar porous material. According to the method, the solid tar can be prepared into the porous material, the porous material is used for advanced treatment of TDA wastewater, and the treatment cost of the wastewater can be greatly reduced while carbon emission is reduced.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of by-products of toluene diisocyanate, and in particular relates to a method and application for preparing porous materials by using TDI solid tar residue. Background technique [0002] Toluene diisocyanate (abbreviated as TDI) has been widely used as a very important diisocyanate in the fields of sponge, polyurethane, coating and curing agent. The current industrial production of TDI is mainly based on phosgenation, which can be divided into liquid-phase phosgenation and gas-phase phosgenation according to the reaction principle. The raw materials for producing TDI are toluene diamine (abbreviated as TDA) and phosgene. In order to improve the yield of phosgenation reaction, TDA and phosgene are generally dissolved in a large amount of inert organic solvents, such as monochlorobenzene, dichlorobenzene and m-chlorobenzene. Diethyl phthalate, etc.; and then undergo a rapid mixing reac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/348C01B32/336C01B32/324C01B32/205C02F1/28C02F101/38
CPCC01B32/348C01B32/336C01B32/324C01B32/205C02F1/283C02F2101/38Y02W10/10
Inventor 邓如雷胡淼魏立彬吴雪峰张宏科
Owner WANHUA CHEM GRP CO LTD